Started dropping the whole request/response system because it fell apart... time to make a ui.Do(func(){ ... })

redo/controls.go

@@ -16,24 +16,15 @@ type Control interface {
 type Button interface {
 	Control
 
-	// OnClicked creates a Request to set the event handler for when the Button is clicked.
-	OnClicked(func(d Doer)) *Request
+	// OnClicked sets the event handler for when the Button is clicked.
+	OnClicked(func())
 
-	// Text and SetText creates a Request that get and set the Button's label text.
-	Text() *Request
-	SetText(text string) *Request
+	// Text and SetText get and set the Button's label text.
+	Text() string
+	SetText(text string)
 }
 
-// NewButton creates a Request to create a new Button with the given label text.
-func NewButton(text string) *Request {
+// NewButton creates a new Button with the given label text.
+func NewButton(text string) {
 	return newButton(text)
 }
-
-// GetNewButton is like NewButton but sends the Request along the given Doer and returns the resultant Button.
-// Example:
-// 	b := ui.GetNewButton(ui.Do, "OK")
-func GetNewButton(c Doer, text string) Button {
-	req := newButton(text)
-	c <- req
-	return (<-req.resp).(Button)
-}

redo/controls_darwin.go

@@ -50,32 +50,19 @@ type button struct {
 	clicked		*event
 }
 
-func newButton(text string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			ctext := C.CString(text)
-			defer C.free(unsafe.Pointer(ctext))
-			b := &button{
-				widgetbase:	newWidget(C.newButton(ctext)),
-				clicked:		newEvent(),
-			}
-			C.buttonSetDelegate(b.id, unsafe.Pointer(b))
-			c <- b
-		},
-		resp:		c,
+func newButton(text string) *button {
+	ctext := C.CString(text)
+	defer C.free(unsafe.Pointer(ctext))
+	b := &button{
+		widgetbase:	newWidget(C.newButton(ctext)),
+		clicked:		newEvent(),
 	}
+	C.buttonSetDelegate(b.id, unsafe.Pointer(b))
+	return b
 }
 
-func (b *button) OnClicked(e func(c Doer)) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			b.clicked.set(e)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (b *button) OnClicked(e func()) {
+	b.clicked.set(e)
 }
 
 //export buttonClicked
@@ -85,25 +72,12 @@ func buttonClicked(xb unsafe.Pointer) {
 	println("button clicked")
 }
 
-func (b *button) Text() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			c <- C.GoString(C.buttonText(b.id))
-		},
-		resp:		c,
-	}
+func (b *button) Text() string {
+	return C.GoString(C.buttonText(b.id))
 }
 
-func (b *button) SetText(text string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			ctext := C.CString(text)
-			defer C.free(unsafe.Pointer(ctext))
-			C.buttonSetText(b.id, ctext)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (b *button) SetText(text string) {
+	ctext := C.CString(text)
+	defer C.free(unsafe.Pointer(ctext))
+	C.buttonSetText(b.id, ctext)
 }

redo/controls_unix.go

@@ -53,38 +53,25 @@ type button struct {
 	clicked		*event
 }
 
-func newButton(text string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			ctext := togstr(text)
-			defer freegstr(ctext)
-			widget := C.gtk_button_new_with_label(ctext)
-			b := &button{
-				widgetbase:	newWidget(widget),
-				button:		(*C.GtkButton)(unsafe.Pointer(widget)),
-				clicked:		newEvent(),
-			}
-			g_signal_connect(
-				C.gpointer(unsafe.Pointer(b.button)),
-				"clicked",
-				C.GCallback(C.buttonClicked),
-				C.gpointer(unsafe.Pointer(b)))
-			c <- b
-		},
-		resp:		c,
+func newButton(text string) *button {
+	ctext := togstr(text)
+	defer freegstr(ctext)
+	widget := C.gtk_button_new_with_label(ctext)
+	b := &button{
+		widgetbase:	newWidget(widget),
+		button:		(*C.GtkButton)(unsafe.Pointer(widget)),
+		clicked:		newEvent(),
 	}
+	g_signal_connect(
+		C.gpointer(unsafe.Pointer(b.button)),
+		"clicked",
+		C.GCallback(C.buttonClicked),
+		C.gpointer(unsafe.Pointer(b)))
+	return b
 }
 
-func (b *button) OnClicked(e func(c Doer)) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			b.clicked.set(e)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (b *button) OnClicked(e func()) {
+	b.clicked.set(e)
 }
 
 //export buttonClicked
@@ -94,25 +81,12 @@ func buttonClicked(bwid *C.GtkButton, data C.gpointer) {
 	println("button clicked")
 }
 
-func (b *button) Text() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			c <- fromgstr(C.gtk_button_get_label(b.button))
-		},
-		resp:		c,
-	}
+func (b *button) Text() string {
+	return fromgstr(C.gtk_button_get_label(b.button))
 }
 
-func (b *button) SetText(text string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			ctext := togstr(text)
-			defer freegstr(ctext)
-			C.gtk_button_set_label(b.button, ctext)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (b *button) SetText(text string) {
+	ctext := togstr(text)
+	defer freegstr(ctext)
+	C.gtk_button_set_label(b.button, ctext)
 }

redo/controls_windows.go

@@ -31,25 +31,12 @@ func (w *widgetbase) parent(win *window) {
 
 // don't embed these as exported; let each Control decide if it should
 
-func (w *widgetbase) text() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			c <- getWindowText(w.hwnd)
-		},
-		resp:		c,
-	}
+func (w *widgetbase) text() string {
+	return getWindowText(w.hwnd)
 }
 
-func (w *widgetbase) settext(text string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.setWindowText(w.hwnd, toUTF16(text))
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *widgetbase) settext(text string) {
+	C.setWindowText(w.hwnd, toUTF16(text))
 }
 
 type button struct {
@@ -59,42 +46,30 @@ type button struct {
 
 var buttonclass = toUTF16("BUTTON")
 
-func newButton(text string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			w := newWidget(buttonclass,
-				C.BS_PUSHBUTTON | C.WS_TABSTOP,
-				0)
-			C.setWindowText(w.hwnd, toUTF16(text))
-			C.controlSetControlFont(w.hwnd)
-			b := &button{
-				widgetbase:	w,
-				clicked:		newEvent(),
-			}
-			C.setButtonSubclass(w.hwnd, unsafe.Pointer(b))
-			c <- b
-		},
-		resp:		c,
+func newButton(text string) *button {
+	op:		func() {
+	w := newWidget(buttonclass,
+		C.BS_PUSHBUTTON | C.WS_TABSTOP,
+		0)
+	C.setWindowText(w.hwnd, toUTF16(text))
+	C.controlSetControlFont(w.hwnd)
+	b := &button{
+		widgetbase:	w,
+		clicked:		newEvent(),
 	}
+	C.setButtonSubclass(w.hwnd, unsafe.Pointer(b))
+	return b
 }
 
-func (b *button) OnClicked(e func(c Doer)) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			b.clicked.set(e)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (b *button) OnClicked(e func()) {
+	b.clicked.set(e)
 }
 
-func (b *button) Text() *Request {
+func (b *button) Text() string {
 	return b.text()
 }
 
-func (b *button) SetText(text string) *Request {
+func (b *button) SetText(text string) {
 	return b.settext(text)
 }
 

redo/window.go

@@ -6,41 +6,32 @@ package ui
 // Windows in package ui can only contain one control; the Stack and Grid layout Controls allow you to pack multiple Controls in a Window.
 // Note that a Window is not itself a Control.
 type Window interface {
-	// SetControl creates a Request to the Window's child Control.
-	SetControl(c Control) *Request
+	// SetControl sets the Window's child Control.
+	SetControl(c Control)
 
-	// Title and SetTitle create Requests to get and set the Window's title, respectively.
-	Title() *Request
-	SetTitle(title string) *Request
+	// Title and SetTitle get and set the Window's title, respectively.
+	Title() string
+	SetTitle(title string)
 
-	// Show and Hide create Requests to bring the Window on-screen and off-screen, respectively.
-	Show() *Request
-	Hide() *Request
+	// Show and Hide bring the Window on-screen and off-screen, respectively.
+	Show()
+	Hide()
 
-	// Close creates a Request to close the Window.
+	// Close closes the Window.
 	// Any Controls within the Window are destroyed, and the Window itself is also destroyed.
 	// Attempting to use a Window after it has been closed results in undefined behavior.
 	// Close unconditionally closes the Window; it neither raises OnClosing nor checks for a return from OnClosing.
 	// TODO make sure the above happens on GTK+ and Mac OS X; it does on Windows
-	Close() *Request
+	Close()
 
-	// OnClosing creates a Request to register an event handler that is triggered when the user clicks the Window's close button.
+	// OnClosing registers an event handler that is triggered when the user clicks the Window's close button.
 	// On systems where whole applications own windows, OnClosing is also triggered when the user asks to close the application.
 	// If this handler returns true, the Window is closed as defined by Close above.
 	// If this handler returns false, the Window is not closed.
-	OnClosing(func(c Doer) bool) *Request
+	OnClosing(func() bool)
 }
 
-// NewWindow returns a Request to create a new Window with the given title text and size.
-func NewWindow(title string, width int, height int) *Request {
+// NewWindow creates a new Window with the given title text and size.
+func NewWindow(title string, width int, height int) Window {
 	return newWindow(title, width, height)
 }
-
-// GetNewWindow is like NewWindow but sends the Request along the given Doer and returns the resultant Window.
-// Example:
-// 	w := ui.GetNewWindow(ui.Do, "Main Window")
-func GetNewWindow(c Doer, title string, width int, height int) Window {
-	req := newWindow(title, width, height)
-	c <- req
-	return (<-req.resp).(Window)
-}

redo/window_darwin.go

@@ -20,106 +20,52 @@ type window struct {
 	spaced	bool
 }
 
-func newWindow(title string, width int, height int) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			id := C.newWindow(C.intptr_t(width), C.intptr_t(height))
-			ctitle := C.CString(title)
-			defer C.free(unsafe.Pointer(ctitle))
-			C.windowSetTitle(id, ctitle)
-			w := &window{
-				id:		id,
-				closing:	newEvent(),
-			}
-			C.windowSetDelegate(id, unsafe.Pointer(w))
-			c <- w
-		},
-		resp:		c,
+func newWindow(title string, width int, height int) *window {
+	id := C.newWindow(C.intptr_t(width), C.intptr_t(height))
+	ctitle := C.CString(title)
+	defer C.free(unsafe.Pointer(ctitle))
+	C.windowSetTitle(id, ctitle)
+	w := &window{
+		id:		id,
+		closing:	newEvent(),
 	}
+	C.windowSetDelegate(id, unsafe.Pointer(w))
+	return w
 }
 
-func (w *window) SetControl(control Control) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			if w.child != nil {		// unparent existing control
-				w.child.unparent()
-			}
-			control.unparent()
-			control.parent(w)
-			w.child = control
-			c <- struct{}{}
-		},
-		resp:		c,
+func (w *window) SetControl(control Control) {
+	if w.child != nil {		// unparent existing control
+		w.child.unparent()
 	}
+	control.unparent()
+	control.parent(w)
+	w.child = control
 }
 
-func (w *window) Title() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			c <- C.GoString(C.windowTitle(w.id))
-		},
-		resp:		c,
-	}
+func (w *window) Title() string {
+	return C.GoString(C.windowTitle(w.id))
 }
 
-func (w *window) SetTitle(title string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			ctitle := C.CString(title)
-			defer C.free(unsafe.Pointer(ctitle))
-			C.windowSetTitle(w.id, ctitle)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) SetTitle(title string) {
+	ctitle := C.CString(title)
+	defer C.free(unsafe.Pointer(ctitle))
+	C.windowSetTitle(w.id, ctitle)
 }
 
-func (w *window) Show() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.windowShow(w.id)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) Show() {
+	C.windowShow(w.id)
 }
 
-func (w *window) Hide() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.windowHide(w.id)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) Hide() {
+	C.windowHide(w.id)
 }
 
-func (w *window) Close() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.windowClose(w.id)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) Close() {
+	C.windowClose(w.id)
 }
 
-func (w *window) OnClosing(e func(c Doer) bool) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			w.closing.setbool(e)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) OnClosing(e func() bool) {
+	w.closing.setbool(e)
 }
 
 //export windowClosing

redo/window_unix.go

@@ -30,128 +30,73 @@ type window struct {
 	spaced	bool
 }
 
-func newWindow(title string, width int, height int) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			widget := C.gtk_window_new(C.GTK_WINDOW_TOPLEVEL)
-			ctitle := togstr(title)
-			defer freegstr(ctitle)
-			layoutw := C.gtk_layout_new(nil, nil)
-			w := &window{
-				widget:		widget,
-				container:		(*C.GtkContainer)(unsafe.Pointer(widget)),
-				bin:			(*C.GtkBin)(unsafe.Pointer(widget)),
-				window:		(*C.GtkWindow)(unsafe.Pointer(widget)),
-				layoutc:		(*C.GtkContainer)(unsafe.Pointer(layoutw)),
-				layout:		(*C.GtkLayout)(unsafe.Pointer(layoutw)),
-				closing:		newEvent(),
-			}
-			C.gtk_window_set_title(w.window, ctitle)
-			g_signal_connect(
-				C.gpointer(unsafe.Pointer(w.window)),
-				"delete-event",
-				C.GCallback(C.windowClosing),
-				C.gpointer(unsafe.Pointer(w)))
-			// we connect to the layout's size-allocate, not to the window's configure-event
-			// this allows us to handle client-side decoration-based configurations (such as GTK+ on Wayland) properly
-			// also see commitResize() in sizing_unix.go for additional notes
-			// thanks to many people in irc.gimp.net/#gtk+ for help (including tristan for suggesting g_signal_connect_after())
-			g_signal_connect_after(
-				C.gpointer(unsafe.Pointer(layoutw)),
-				"size-allocate",
-				C.GCallback(C.windowResizing),
-				C.gpointer(unsafe.Pointer(w)))
-			// TODO size
-			C.gtk_container_add(w.container, layoutw)
-			c <- w
-		},
-		resp:		c,
+func newWindow(title string, width int, height int) *window {
+	widget := C.gtk_window_new(C.GTK_WINDOW_TOPLEVEL)
+	ctitle := togstr(title)
+	defer freegstr(ctitle)
+	layoutw := C.gtk_layout_new(nil, nil)
+	w := &window{
+		widget:		widget,
+		container:		(*C.GtkContainer)(unsafe.Pointer(widget)),
+		bin:			(*C.GtkBin)(unsafe.Pointer(widget)),
+		window:		(*C.GtkWindow)(unsafe.Pointer(widget)),
+		layoutc:		(*C.GtkContainer)(unsafe.Pointer(layoutw)),
+		layout:		(*C.GtkLayout)(unsafe.Pointer(layoutw)),
+		closing:		newEvent(),
 	}
+	C.gtk_window_set_title(w.window, ctitle)
+	g_signal_connect(
+		C.gpointer(unsafe.Pointer(w.window)),
+		"delete-event",
+		C.GCallback(C.windowClosing),
+		C.gpointer(unsafe.Pointer(w)))
+	// we connect to the layout's size-allocate, not to the window's configure-event
+	// this allows us to handle client-side decoration-based configurations (such as GTK+ on Wayland) properly
+	// also see commitResize() in sizing_unix.go for additional notes
+	// thanks to many people in irc.gimp.net/#gtk+ for help (including tristan for suggesting g_signal_connect_after())
+	g_signal_connect_after(
+		C.gpointer(unsafe.Pointer(layoutw)),
+		"size-allocate",
+		C.GCallback(C.windowResizing),
+		C.gpointer(unsafe.Pointer(w)))
+	// TODO size
+	C.gtk_container_add(w.container, layoutw)
+	return w
 }
 
-func (w *window) SetControl(control Control) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			if w.child != nil {		// unparent existing control
-				w.child.unparent()
-			}
-			control.unparent()
-			control.parent(w)
-			w.child = control
-			c <- struct{}{}
-		},
-		resp:		c,
+func (w *window) SetControl(control Control) {
+	if w.child != nil {		// unparent existing control
+		w.child.unparent()
 	}
+	control.unparent()
+	control.parent(w)
+	w.child = control
 }
 
-func (w *window) Title() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			c <- fromgstr(C.gtk_window_get_title(w.window))
-		},
-		resp:		c,
-	}
+func (w *window) Title() string {
+	return fromgstr(C.gtk_window_get_title(w.window))
 }
 
-func (w *window) SetTitle(title string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			ctitle := togstr(title)
-			defer freegstr(ctitle)
-			C.gtk_window_set_title(w.window, ctitle)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) SetTitle(title string) {
+	ctitle := togstr(title)
+	defer freegstr(ctitle)
+	C.gtk_window_set_title(w.window, ctitle)
 }
 
-
-func (w *window) Show() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.gtk_widget_show_all(w.widget)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) Show() {
+	C.gtk_widget_show_all(w.widget)
 }
 
-func (w *window) Hide() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.gtk_widget_hide(w.widget)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) Hide() {
+	C.gtk_widget_hide(w.widget)
 }
 
-func (w *window) Close() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.gtk_widget_destroy(w.widget)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) Close() {
+	C.gtk_widget_destroy(w.widget)
 }
 
-func (w *window) OnClosing(e func(c Doer) bool) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			w.closing.setbool(e)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) OnClosing(e func() bool) {
+	w.closing.setbool(e)
 }
 
 //export windowClosing

redo/window_windows.go

@@ -35,109 +35,55 @@ func makeWindowWindowClass() error {
 	return nil
 }
 
-func newWindow(title string, width int, height int) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			w := &window{
-				// hwnd set in WM_CREATE handler
-				closing:	newEvent(),
-			}
-			hwnd := C.newWindow(toUTF16(title), C.int(width), C.int(height), unsafe.Pointer(w))
-			if hwnd != w.hwnd {
-				panic(fmt.Errorf("inconsistency: hwnd returned by CreateWindowEx() (%p) and hwnd stored in window (%p) differ", hwnd, w.hwnd))
-			}
-			c <- w
-		},
-		resp:		c,
+func newWindow(title string, width int, height int) *window {
+	w := &window{
+		// hwnd set in WM_CREATE handler
+		closing:	newEvent(),
+	}
+	hwnd := C.newWindow(toUTF16(title), C.int(width), C.int(height), unsafe.Pointer(w))
+	if hwnd != w.hwnd {
+		panic(fmt.Errorf("inconsistency: hwnd returned by CreateWindowEx() (%p) and hwnd stored in window (%p) differ", hwnd, w.hwnd))
+	}
+	return w
+}
+
+func (w *window) SetControl(control Control) {
+	if w.child != nil {		// unparent existing control
+		w.child.unparent()
+	}
+	control.unparent()
+	control.parent(w)
+	w.child = control
+}
+
+func (w *window) Title() string {
+	return getWindowText(w.hwnd)
+}
+
+func (w *window) SetTitle(title string) {
+	C.setWindowText(w.hwnd, toUTF16(title))
+}
+
+func (w *window) Show() {
+	if !w.shownbefore {
+		C.ShowWindow(w.hwnd, C.nCmdShow)
+		C.updateWindow(w.hwnd)
+		w.shownbefore = true
+	} else {
+		C.ShowWindow(w.hwnd, C.SW_SHOW)
 	}
 }
 
-func (w *window) SetControl(control Control) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			if w.child != nil {		// unparent existing control
-				w.child.unparent()
-			}
-			control.unparent()
-			control.parent(w)
-			w.child = control
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) Hide() {
+	C.ShowWindow(w.hwnd, C.SW_HIDE)
 }
 
-func (w *window) Title() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			c <- getWindowText(w.hwnd)
-		},
-		resp:		c,
-	}
+func (w *window) Close() {
+	C.windowClose(w.hwnd)
 }
 
-func (w *window) SetTitle(title string) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.setWindowText(w.hwnd, toUTF16(title))
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
-}
-
-func (w *window) Show() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			if !w.shownbefore {
-				C.ShowWindow(w.hwnd, C.nCmdShow)
-				C.updateWindow(w.hwnd)
-				w.shownbefore = true
-			} else {
-				C.ShowWindow(w.hwnd, C.SW_SHOW)
-			}
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
-}
-
-func (w *window) Hide() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.ShowWindow(w.hwnd, C.SW_HIDE)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
-}
-
-func (w *window) Close() *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			C.windowClose(w.hwnd)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
-}
-
-func (w *window) OnClosing(e func(Doer) bool) *Request {
-	c := make(chan interface{})
-	return &Request{
-		op:		func() {
-			w.closing.setbool(e)
-			c <- struct{}{}
-		},
-		resp:		c,
-	}
+func (w *window) OnClosing(e func() bool) {
+	w.closing.setbool(e)
 }
 
 //export storeWindowHWND